Sony's flagship for next year, the C660X Xperia Yuga will be named as Xperia Z. The phone will also have IP certification for dust and water resistance and a low-reflectivity screen.The Sony Xperia Z is set to receive IP57 certification for dust and water resistance similar to the Xperia V and Xperia Acro S. The smartphone will have a pretty compact slim body measuring 139 x 71 x 7.9mm. There's no info on the weight yet, though.One of the key features of the Sony Xperia Z will be the 5" 1080p screen. It will reportedly use Sony's OptiContrast technology (Xperia V and Xperia Tablet S use the same tech). Sony mostly uses it on TV's to reduce glare.